有些物理问题涉及的因素较多,过程复杂,我们往往难以洞察其变化规律并对其作出迅速准确的判断.但是,如果我们将问题推想到极端状态或极端条件下进行分析,问题有时会顿时变得明朗而简单.像这样将问题从一般状态推到特殊状态进行分析处理的解题方法就是极限法,又称极端法.用极端 Some physics problems involve many factors and the process is complex. It is often difficult to gain insight into the laws of change and make quick and accurate judgments. However, if we think of the problem as being analyzed under extreme conditions or extreme conditions, the problem sometimes changes suddenly. It is clear and simple. The problem solving method that pushes the problem from the general state to the special state for analytical processing is the limit method, also called the extreme method.